Signal Circuit Inspection

Check Open or Short in signal circuit
1. IG KEY "OFF".
2. Disconnect IATS connector.
3. IG KEY "ON" & ENG "OFF"
4. Measure voltage between signal terminal of IATS harness connector and chassis ground.
  Specification: Approx. 5V
  
  Fig 1: Measuring Voltage Between Signal Terminal Of IATS Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Identifying MAPS, PCM And ECM Connector Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured voltage within specification?
  YES
  - Go to " Check short to ground in harness" as follows.
  NO
  - Check for Open or Short in signal circuit. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check Short to ground in signal circuit
1. IG KEY "OFF".
2. Disconnect IATS and ECM connector.
3. Measure resistance between signal and ground terminal of IATS harness connector.
  Specification: Infinite
  
  Fig 3: Measuring Resistance Between Signal And Ground Terminal Of IATS Harness Connector
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 4: Identifying MAPS, PCM And ECM Connector Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured resistance within specification?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Check for short to ground in signal circuit. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.